UpdateInfo: Fix warning about initialization order.

Change-Id: I2f6d9188f7c4ce0b8413c081be18f9fef70c2a17
Reviewed-by: Orgad Shaneh <orgads@gmail.com>
Fix compilation of update info plugin with Qt 4.

Change-Id: I7878a67413a9f4b04a12025e4b4dc5c65e0ee3c7
Reviewed-by: Kai Koehne <kai.koehne@digia.com>